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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e373a1b003d2e6268b529ad624023d7df9d4619b7b26d3c09152457cb06c2210' 
  AND token = 'EyglFBk8RW8fgGRoGR2WFlaq2BAJ1iytknn7lESZNG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}